To Gloria's credit...
She is an accomplished rider. She truly, genuinely loves her horses. She doesn't resort to gadgets and "band-aid" fixes to overcome or deal with training issues. In her trail pictures, Will is being ridden on a relaxed rein w/light contact, one-handed in the second pic. In the schooling pictures again, she doesn't have tight, heavy contact on the reins, and Will is forward, working quite happily in a double. It is quite common to train & school dressage horses in a double when appropriate.
Perhaps find out more about rider before questioning their experience & telling them what to do with a horse you've never even met.
Just my $.02.
K~